EP3635904B1 - Fourniture d'informations concernant un canal de commande - Google Patents

Fourniture d'informations concernant un canal de commande Download PDF

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Publication number
EP3635904B1
EP3635904B1 EP18729411.1A EP18729411A EP3635904B1 EP 3635904 B1 EP3635904 B1 EP 3635904B1 EP 18729411 A EP18729411 A EP 18729411A EP 3635904 B1 EP3635904 B1 EP 3635904B1
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Prior art keywords
control channel
sequence
base
symbol
uci
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German (de)
English (en)
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EP3635904A1 (fr
Inventor
Fredrik Lindqvist
Jung-Fu Cheng
Robert Baldemair
Havish KOORIPATY
Sorour Falahati
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2035—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using a single or unspecified number of carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
    • H04L5/10—Channels characterised by the type of signal the signals being represented by different frequencies with dynamo-electric generation of carriers; with mechanical filters or demodulators

Definitions

  • the disclosure relates to providing information on a control channel having two multiplexed sequences based on at least one base sequence, the two multiplexed sequences including a first control channel sequence comprising modulated samples.
  • the new radio (NR) short physical uplink control channel is to be designed for carrying 1 or 2 uplink control information (UCI) bits. See, for example 3GPP TR 38.802 v14.0.0.
  • the format spans 1 or 2 symbols in time and (at least) 1 physical resource block (PRB) of 12 sub carriers in frequency.
  • PRB physical resource block
  • Sequence modulation uses frequency division multiplexing (FDM) of two assigned sequences, where one sequence is modulated by the uplink control information (UCI) while the other sequence consists of demodulation reference signals (DM-RS) (i.e., known pilots) to allow for coherent demodulation at the receiver. That is, the UCI is first mapped to a binary phase shift keyed/ quadrature phase shift keyed (BPSK/QPSK) symbol which modulates (i.e., multiplies) an assigned sequence to be transmitted together with the frequency division multiplexed DM-RS sequence.
  • FDM frequency division multiplexing
  • BPSK/QPSK binary phase shift keyed/ quadrature phase shift keyed
  • the sequence modulation format is shown in FIG. 1 .
  • the subcarriers of a PRB (12 subcarriers) are split into two combs, each of length 6, where one comb is used for DM-RS and the other comb is used for UCI.
  • a DM-RS overhead of 1 ⁇ 2 is used since the targeted signal to noise ratio (SNR) is fairly low.
  • SNR targeted signal to noise ratio
  • Each user is assigned one cyclic shift for DM-RS and one cyclic shift for the UCI, for example semi-statistically configured by radio resource control (RRC), see for example 3GPP TS 38.331 V0.0.3.
  • RRC radio resource control
  • the multiplexing capacity is independent of UCI size and is up to 6 users per PRB, corresponding to a maximum 6 cyclic shifts of the base sequence.
  • FIG. 2 depicts sequence selection.
  • the sequences are assumed to be computer-optimized sequences as in Long Term Evolution (LTE). All users multiplexed on the same PRB are assigned the same base sequence but different cyclic shifts (CS). For 1-bit UCI, a user is assigned to 2 cyclic shifts and the multiplexing capacity is 6 users per PRB. For a payload of 2 bits, 4 cyclic shifts are needed per user and hence up to 3 users can be multiplexed on a single PRB.
  • LTE Long Term Evolution
  • CS cyclic shifts
  • the sequence selection (SS) format has low peak-to-average-power-ratio (PAPR) and low cubic metric (CM) which are desirable properties, especially for improving cell coverage.
  • PAPR peak-to-average-power-ratio
  • CM cubic metric
  • simulation results show loss of performance for SS on highly dispersive channels due to lack of coherent demodulation.
  • Sequence modulation on the other hand provides coherent demodulation but generally lacks the desirable low PAPR and low CM and hence, suffers from reduced coverage.
  • 3GPP Tdoc R1-1706950 compares the sequence selection and sequence modulation options and proposes to study the use of a new set of computer generated base sequences compared to the existing LTE ones.
  • 3GPP Tdoc R1-1709080 compares the sequence selection and sequence modulation options and indicates that sequence selection outperforms sequence modulation from an SNR perspective.
  • One of the problems addressed by the present application is how to provide information on a short control channel which provides coherent demodulation whilst maintaining a low peak-to-average power ratio (PAPR) and low Cubic metric(CM).
  • PAPR peak-to-average power ratio
  • CM Cubic metric
  • the sequence modulation format is enhanced by selecting the FDM scheme of two sequences, one for UCI and one for DM-RS, respectively, together with restricting the modulation to BPSK (i.e., also for 2 bit UCI). Multiple users can be multiplexed onto the same time-frequency resource by allocating additional cyclic shifts.
  • a 2 bit payload is transmitted with low PAPR/CM by using one bit to select a sequence and using the other bit to modulate the selected sequence.
  • a further advantage is obtained by reusing the already agreed upon specified set of DM-RS sequences in LTE it is possible to minimize the specification impacts on New Radio (NR), and hence avoid the lengthy exercise of designing new low PAPR/CM sequences, are re-used.
  • Some embodiments include a wireless device for providing information on a control channel.
  • the wireless device includes processing circuitry configured to sample even samples of the base sequence and modulating the sampled even samples to create a first sequence, perform a second sampling of odd samples of the base sequence to create a second sequence and frequency division multiplex the first and second sequences to produce the control channel transmission.
  • the control channel transmission is a short physical uplink control channel, sPUCCH, transmission.
  • the modulating of the sampled even samples is by a binary phase shift keying, BPSK, symbol.
  • the BPSK symbol corresponds to a first of two bits of an uplink control information, UCI, symbol.
  • a second bit of an uplink control information, UCI, symbol having at least two bits determines one of two cyclic shifts of the base sequence.
  • the two cyclic shifts are based on a base cyclic shift received in downlink control information, DCI.
  • the base sequence is one of two base sequences selected by a bit of uplink control information, UCI, symbol.
  • the second control channel sequence includes a demodulation reference signal, DMRS.
  • Some embodiments include a wireless device for providing information on a control channel.
  • the wireless device includes processing circuitry configured to sample even samples of the base sequence and modulating the sampled even samples to create a first sequence, perform a second sampling of odd samples of the base sequence to create a second sequence and frequency division multiplex the first and second sequences to produce the control channel transmission.
  • the control channel transmission is a short physical uplink control channel, sPUCCH, transmission.
  • the modulating of the sampled even samples is by a binary phase shift keying, BPSK, symbol.
  • the BPSK symbol corresponds to a first of two bits of an uplink control information, UCI, symbol.
  • a second bit of an uplink control information, UCI, symbol having at least two bits determines one of two cyclic shifts of the base sequence.
  • the two cyclic shifts are based on a base cyclic shift received in downlink control information, DCI.
  • the base sequence is one of two base sequences selected by a bit of uplink control information, UCI, symbol.
  • the second control channel sequence includes a demodulation reference signal, DMRS.
  • Some embodiments include a method in a network node configured to process a received uplink control channel.
  • the method includes frequency de-multiplexing a received control channel transmission to obtain a first control channel sequence and a second control channel sequence.
  • the method includes obtaining a demodulation reference signal, DM-RS, from the second control channel sequence.
  • the method also includes demodulating the first control channel sequence to obtain uplink control information.
  • the uplink control channel transmission is a short physical uplink control channel, sPUCCH, transmission.
  • the first sequence is modulated by a binary phase shift keying, BPSK, symbol.
  • BPSK binary phase shift keying
  • a first of two bits of the uplink control information, UCI corresponds to a BPSK symbol.
  • a second bit of an uplink control information, UCI, symbol having at least two bits determines one of two cyclic shifts of a base sequence.
  • the base sequence is one of two base sequences selected by a bit of uplink control information, UCI.
  • the method further includes transmitting a base cyclic shift in downlink control information, the base cyclic shift used by a wireless device to perform a cyclic shift of at least one of the first and second sequences.
  • Some embodiments include a network node configured to process a received uplink control channel transmission.
  • the network node includes processing circuitry configured to frequency division de-multiplex a received control channel transmission to obtain a first control channel sequence and a second control channel sequence, obtain a demodulation reference signal, DM-RS, from the second control channel sequence, and demodulate the first control channel sequence to obtain uplink control information.
  • processing circuitry configured to frequency division de-multiplex a received control channel transmission to obtain a first control channel sequence and a second control channel sequence, obtain a demodulation reference signal, DM-RS, from the second control channel sequence, and demodulate the first control channel sequence to obtain uplink control information.
  • the uplink control channel transmission is a short physical uplink control channel, sPUCCH, transmission.
  • the first control channel sequence is modulated by a binary phase shift keying, BPSK, symbol.
  • BPSK binary phase shift keying
  • a first of two bits of the uplink control information, UCI corresponds to a BPSK symbol.
  • a second bit of an uplink control information, UCI, symbol having at least two bits determines one of two cyclic shifts of a base sequence.
  • the base sequence is one of two base sequences selected by a bit of uplink control information, UCI, symbol.
  • the processing circuitry is further configured to transmit a base cyclic shift in downlink control information, the base cyclic shift used by a wireless device 16 to perform a cyclic shift of at least one of the first and second sequences.
  • the embodiments reside primarily in combinations of apparatus components and processing steps related to providing an uplink control channel having two multiplexed sequences based on at least one base sequence, the two multiplexed sequences including a first sequence for carrying uplink control information (UCI) and a second sequence having a demodulation reference signal (DM-RS).
  • UCI uplink control information
  • DM-RS demodulation reference signal
  • Some embodiments include a wireless device 16 for providing information on a control channel having two multiplexed bit sequences based on a base sequence.
  • a method in a wireless device for providing information on a control channel includes sampling even samples of a base sequence and modulating the sampled even samples to create a first control channel sequence.
  • the method includes performing a second sampling of odd samples of the base sequence to create a second control channel sequence.
  • the method also includes frequency division multiplexing the first and second control channel sequences to produce the control channel transmission.
  • the first control sequence is described herein as being derived from 'even' samples of a base sequence and the second control sequence is derived from 'odd' samples of a base sequence, however this selection is arbitrary and does not limit the inventive concept.
  • a 2 bit payload is transmitted with low PAPR/CM by using one bit to select a sequence and using the other bit to modulate the selected sequence.
  • relational terms such as “first” and “second,” “top” and “bottom,” and the like, may be used solely to distinguish one entity or element from another entity or element without necessarily requiring or implying any physical or logical relationship or order between such entities or elements.
  • Implicit indication may for example be based on position and/or resource used for transmission.
  • Explicit indication may for example be based on a parametrization with one or more parameters, and/or one or more index or indices, and/or one or more bit patterns representing the information. It may in particular be considered that control signaling as described herein, based on the utilized resource sequence, implicitly indicates the control signaling type.
  • signal used herein can be any physical signal or physical channel.
  • Examples of physical signals are reference signal such as PSS, SSS, CRS, PRS etc.
  • the term physical channel (e.g., in the context of channel reception) used herein is also called a 'channel'.
  • Examples of physical channels are MIB, PBCH, NPBCH, PDCCH, PDSCH, sPUCCH, sPDSCH. sPUCCH. sPUSCH, MPDCCH, NPDCCH, NPDSCH, E-PDCCH, PUSCH, PUCCH, NPUSCH etc. These terms/abbreviations may be used according to 3GPP standard language, in particular according to LTE or NR.
  • a cell For cellular communication there is provided at least one uplink (UL) connection with an associated channel and carrier and at least one downlink (DL) connection with an associated channel and carrier.
  • a cell is defined which may be provided by a network node, in particular a base station, eNodeB in Long Term Evolution (LTE) or a gNodeB in New Radio (NR).
  • An uplink direction may refer to a data transfer direction from a terminal to a network node, e.g., base station and/or relay station.
  • a downlink direction may refer to a data transfer direction from a network node, e.g., base station and/or relay node, to a terminal.
  • UL and DL may be associated with different frequency resources, e.g., carriers and/or spectral bands.
  • a cell may comprise at least one uplink carrier and at least one downlink carrier, which may have different frequency bands.
  • a network node e.g., a base station or eNodeB or gNB, may be adapted to provide and/or define and/or control one or more cells, e.g., a primary cell (PCell) and/or a licensed assisted (LA) cell.
  • PCell primary cell
  • LA licensed assisted
  • Transmitting in the downlink may pertain to transmission from the network or network node to the terminal.
  • Transmitting in the uplink may pertain to transmission from the terminal to the network or network node.
  • Transmitting in sidelink may pertain to (direct) transmission from one terminal to another.
  • Uplink, downlink and sidelink (e.g., sidelink transmission and reception) may be considered communication directions.
  • uplink and downlink may also be used to described wireless communication between network nodes, e.g. for wireless backhaul and/or relay communication and/or (wireless) network communication for example between base stations or similar network nodes, in particular communication terminating at such. It may be considered that backhaul and/or relay communication and/or network communication is implemented as a form of sidelink or uplink communication or similar thereto.
  • configuring may include determining configuration data representing the configuration and providing, e.g. transmitting, it to one or more other nodes (parallel and/or sequentially), which may transmit it further to the radio node (or another node, which may be repeated until it reaches the wireless device).
  • configuring a radio node e.g., by a network node or other device, may include receiving configuration data and/or data pertaining to configuration data, e.g., from another node like a network node, which may be a higher-level node of the network, and/or transmitting received configuration data to the radio node.
  • determining a configuration and transmitting the configuration data to the radio node may be performed by different network nodes or entities, which may be able to communicate via a suitable interface, e.g., an X2 interface in the case of LTE or a corresponding interface for NR.
  • Configuring a terminal may comprise scheduling downlink and/or uplink transmissions for the terminal, e.g. downlink data and/or downlink control signaling and/or DCI and/or uplink control or data or communication signaling, in particular acknowledgement signaling, and/or configuring resources and/or a resource pool therefor.
  • configuring a terminal e.g. WD
  • Signaling may comprise one or more signals and/or symbols.
  • Reference signaling may comprise one or more reference signals and/or symbols.
  • Data signaling may pertain to signals and/or symbols containing data, in particular user data and/or payload data and/or data from a communication layer above the radio and/or physical layer/s. It may be considered that demodulation reference signaling comprises one or more demodulation signals and/or symbols.
  • Demodulation reference signaling may in particular comprise DM-RS according to 3GPP and/or LTE and/or NR technologies. Demodulation reference signaling may generally be considered to represent signaling providing reference for a receiving device like a terminal to decode and/or demodulate associated data signaling or data.
  • Demodulation reference signaling may be associated to data or data signaling, in particular to specific data or data signaling. It may be considered that data signaling and demodulation reference signaling are interlaced and/or multiplexed, e.g. arranged in the same time interval covering e.g. a subframe or slot or symbol, and/or in the same time-frequency resource structure like a resource block.
  • a resource element may represent a smallest time-frequency resource, e.g. representing the time and frequency range covered by one symbol or a number of bits represented in a common modulation.
  • a resource element may e.g. cover a symbol time length and a subcarrier, in particular in 3GPP and/or LTE or NR standards.
  • a data transmission may represent and/or pertain to transmission of specific data, e.g. a specific block of data and/or transport block.
  • demodulation reference signaling may comprise and/or represent a sequence of signals and/or symbols, which may identify and/or define the demodulation reference signaling.
  • Data or information may refer to any kind of data, in particular any one of and/or any combination of control data or user data or payload data.
  • Control information (which may also be referred to as control data) may refer to data controlling and/or scheduling and/or pertaining to the process of data transmission and/or the network or terminal operation.
  • 3GPP third generation partnership project
  • LTE long term evolution
  • NR i.e., 5G
  • WCDMA wideband code division multiple access
  • UMB ultra mobile broadband
  • GSM global system for mobile communications
  • eNodeB gNodeB
  • wireless device should be considered non-limiting and does in particular not imply a certain hierarchical relation between the two; in general "eNodeB” could be considered as device 1 and “wireless device” device 2, and these two devices communicate with each other over some radio channel. Also, while some of the principles of the disclosure focus on wireless transmissions in the downlink/uplink, they may be equally applicable in the uplink/downlink.
  • wireless device used herein may refer to any type of wireless device communicating with a network node and/or with another wireless device in a cellular or mobile communication system.
  • Examples of a wireless device are user equipment (UE), target device, device to device (D2D) wireless device, machine type wireless device or wireless device capable of machine to machine (M2M) communication, PDA, iPAD, Tablet, mobile terminals, smart phone, laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongles etc.
  • network node used herein may refer to a radio network node or another network node, e.g., a core network node, MSC, MME, O&M, OSS, SON, positioning node (e.g. E-SMLC), MDT node, etc.
  • a radio network node e.g., MSC, MME, O&M, OSS, SON, positioning node (e.g. E-SMLC), MDT node, etc.
  • radio network node or “network node” used herein can be any kind of network node comprised in a radio network which may further comprise any of base station (BS), radio base station, base transceiver station (BTS), base station controller (BSC), radio network controller (RNC), evolved Node B (eNB or eNodeB), Node B, gNodeB in New Radio (NR), multi-standard radio (MSR) radio node such as MSR BS, relay node, donor node controlling relay, radio access point (AP), transmission points, transmission nodes, Remote Radio Unit (RRU) Remote Radio Head (RRH), nodes in distributed antenna system (DAS), etc.
  • BS base station
  • BTS base transceiver station
  • BSC base station controller
  • RNC radio network controller
  • eNB or eNodeB evolved Node B
  • Node B Node B
  • MSR multi-standard radio
  • MSR multi-standard radio
  • functions described herein as being performed by a wireless device or a network node may be distributed over a plurality of wireless devices and/or network nodes.
  • FIG. 3 is a block diagram of a wireless communication network configured according to principles set forth herein.
  • the wireless communication network 10 includes a cloud 12 which may include the Internet and/or the public switched telephone network (PSTN). Cloud 12 may also serve as a backhaul network of the wireless communication network 10.
  • the wireless communication network 10 includes one or more network nodes 14A and 14B, which may communicate directly via an X2 interface in LTE embodiments, and are referred to collectively as network nodes 14. It is contemplated that other interface types can be used for communication between network nodes 14 for other communication protocols such as New Radio (NR).
  • NR New Radio
  • the network nodes 14 may serve wireless devices 16A and 16B, referred to collectively herein as wireless devices 16.
  • the wireless communication network 10 may typically include many more wireless devices (WDs) 16 and network nodes 14. Further, in some embodiments, WDs 16 may communicate directly using what is sometimes referred to as a side link connection.
  • the network node 14 has a frequency division de-multiplexing unit or module 18 configured to frequency de-multiplex a received control channel, such as a short physical uplink control channel (sPUCCH), to obtain a first sequence and a second sequence.
  • the first sequence is demodulated to obtain UCI from the wireless device 16 and the second sequence has DM-RSs.
  • the wireless device 16 has a frequency division multiplexing unit or module 20 configured to frequency division multiplex the first and second sequences to produce the control channel that is transmitted to the network node 14 by the wireless device 16. After the demultiplexing the obtained DMRS signal can be used to estimate the channel from which coherent demodulation of the UCI can be achieved.
  • FIG. 4 is a block diagram of a network node 14 configured according to principles set forth herein.
  • the network node 14 has processing circuitry 22.
  • the processing circuitry may include a memory 24 and processor 26, the memory 24 containing instructions which, when executed by the processor 26, configure processor 26 to perform the one or more functions described herein.
  • processing circuitry 22 may include integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry).
  • Processing circuitry 22 may include and/or be connected to and/or be configured for accessing (e.g., writing to and/or reading from) memory 24, which may include any kind of volatile and/or non-volatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • memory 24 may be configured to store code executable by control circuitry and/or other data, e.g., data pertaining to communication, e.g., configuration and/or address data of nodes, etc.
  • Processing circuitry 22 may be configured to control any of the methods described herein and/or to cause such methods to be performed, e.g., by processor 26. Corresponding instructions may be stored in the memory 24, which may be readable and/or readably connected to the processing circuitry 22.
  • processing circuitry 22 may include a controller, which may include a microprocessor and/or microcontroller and/or FPGA (Field-Programmable Gate Array) device and/or ASIC (Application Specific Integrated Circuit) device. It may be considered that processing circuitry 22 includes or may be connected or connectable to memory, which may be configured to be accessible for reading and/or writing by the controller and/or processing circuitry 22.
  • the memory 24 is configured to store control channel information 28.
  • the control channel is a short physical uplink control channel (sPUCCH).
  • the processing circuitry 22 is configured to implement a frequency division de-multiplexing unit 18 configured to frequency de-multiplex a received control channel to obtain a first control channel sequence and a second control channel sequence.
  • a demodulator 30 is configured to demodulate the first control channel sequence to obtain uplink control information.
  • a demodulation reference signal, DM-RS, obtainer 32 is configured to obtain a DM-RS from the second control channel sequence.
  • a transceiver 34 is configured to receive the control channel information 28 from the wireless device 16. After the demultiplexing the obtained DMRS signal can be used to estimate the channel from which coherent demodulation of the UCI can be achieved.
  • FIG. 5 is a block diagram of an alternative embodiment of a network node 14 configured according to principles set forth herein.
  • the memory module 25 includes the control channel 28.
  • a frequency division de-multiplexing module 19 is configured to frequency de-multiplex a received control channel to obtain a first control channel sequence and a second control channel sequence.
  • a demodulator module 31 is configured to demodulate the first control channel sequence to obtain uplink control information.
  • a demodulation reference signal, DM-RS, obtainer module 33 is configured to obtain a DM-RS from the second control channel sequence. After the demultiplexing the obtained DMRS signal can be used to estimate the channel from which coherent demodulation of the UCI can be achieved.
  • FIG. 6 is a block diagram of a wireless device 16 configured according to principles set forth herein.
  • the wireless device 16 has processing circuitry 42.
  • the processing circuitry may include a memory 44 and processor 46, the memory 44 containing instructions which, when executed by the processor 46, configure processor 46 to perform the one or more functions described herein.
  • processing circuitry 42 may include integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry).
  • Processing circuitry 42 may include and/or be connected to and/or be configured for accessing (e.g., writing to and/or reading from) memory 44, which may include any kind of volatile and/or non-volatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • memory 44 may be configured to store code executable by control circuitry and/or other data, e.g., data pertaining to communication, e.g., configuration and/or address data of nodes, etc.
  • Processing circuitry 42 may be configured to control any of the methods described herein and/or to cause such methods to be performed, e.g., by processor 46. Corresponding instructions may be stored in the memory 44, which may be readable and/or readably connected to the processing circuitry 42.
  • processing circuitry 42 may include a controller, which may include a microprocessor and/or microcontroller and/or FPGA (Field-Programmable Gate Array) device and/or ASIC (Application Specific Integrated Circuit) device. It may be considered that processing circuitry 42 includes or may be connected or connectable to memory, which may be configured to be accessible for reading and/or writing by the controller and/or processing circuitry 42.
  • the memory 44 is configured to store control channel 28 information.
  • the control channel is a short physical uplink control channel (sPUCCH).
  • the processing circuitry 42 is configured to implement an even sample sampler 48 configured to sample even samples of the base sequence.
  • the sequence modulator 50 is configured to modulate the sampled even samples to create a first control channel sequence. In some embodiments the modulation is with a binary phase shift keying, BPSK, symbol.
  • the processing circuitry 42 also implements an odd sample sampler 52 configured to perform a second sampling of odd samples of the base sequence to create a second control channel sequence.
  • the frequency division multiplex unit 20 is configured to frequency division multiplex the first and second control channel sequences to produce the control channel transmission.
  • the transceiver 54 is configured to transmit the control channel information to the network node 14.
  • FIG. 7 is a block diagram of an alternative embodiment of a wireless device 16 configured according to principles set forth herein.
  • the memory module 45 is configured to store the control channel 28.
  • the even sample sampling module 49 is configured to sample even samples of the base sequence.
  • the sequence modulator module 51 is configured to modulate the sampled even samples with a binary phase shift keying, BPSK, symbol to create a first control channel sequence.
  • the odd sample sampling module 53 is configured to perform a second sampling of odd samples of the base sequence to create a second control channel sequence.
  • the frequency division multiplexing module 20 configured to frequency division multiplex the first and second control channel sequences to produce the control channel transmission.
  • FIG. 8 is a flowchart of an exemplary process in a network node 14 for processing a received control channel according to principles set forth herein.
  • the process includes frequency de-multiplexing, via frequency division de-multiplexer 18, a received control channel to obtain a first control channel sequence and a second control channel sequence (block S100).
  • the process also includes obtaining, via the DM-RS obtainer unit, a demodulation reference signal, DM-RS, from the second control channel sequence (block S102).
  • the process also includes demodulating, via the demodulator 30, the first control channel sequence to obtain uplink control information (block S104). After the demultiplexing the obtained DMRS signal can be used to estimate the channel from which coherent demodulation of the UCI can be achieved.
  • FIG. 9 is a flowchart of an exemplary process in a wireless device 16 for providing a control channel having two multiplexed bit sequences based on a base sequence.
  • the process includes sampling, via the even sample sampler 48, even samples of the base sequence and modulating, via the sequence modulator 50, the sampled even samples to create a first control channel sequence (block S106).
  • the process also includes performing a second sampling, via the odd sample sampler 52, of odd samples of the base sequence to create a second control channel sequence (block S108).
  • the process also includes frequency division multiplexing, via the frequency division multiplexer 20, the first and second control channel sequences to produce the control channel transmission (block S110).
  • Some embodiments provide a short PUCCH with low PAPR/CM combined with coherent demodulation for improved performance on highly dispersive channels for 1 or 2 bit payloads.
  • FIG. 10 illustrates, using basic building blocks, the method for creating the two sequences
  • FIG. 11 illustrates the frequency division multiplexing (FDM) of the sequences, i.e., their placement in the frequency domain and their inverse fast Fourier transform (IFFT) to the time domain.
  • FDM frequency division multiplexing
  • IFFT inverse fast Fourier transform
  • the composite transmit signal in the time domain, y(n) is either the original DM-RS sequence (including the assigned CS) or a cyclic shifted version of it, depending on the value X. Since the circular shifting does not change the PAPR/CM, it can be concluded that the low CM/PAPR of the original length-12 sequence is maintained.
  • RRC radio resource control
  • DCI downlink control information
  • Two cyclic shifts of a base sequence R(k) that is configured to the WD 16 via the RRC signaling may be assigned to one WD 16.
  • the value of the first bit of the 2-bits UCI may be used to determine one out of the two allocated cyclic shifts ⁇ CS0, CS1 ⁇ , e.g., first bit 0 ⁇ CS0, first bit 1 ⁇ CS1.
  • the above-described method may be applied to create the sequences S1 and S2 where now the second bit of the 2-bits of UCI determines the BPSK symbol X.
  • the second bit of the 2-bit UCI can be used to determine the cyclic shift to use and the first bit can modulate sequence S_1 (k). This embodiment is illustrated in FIG. 13 .
  • the two cyclic shifts of the base sequence R(k) in the above embodiment may be assigned via RRC signaling and the cyclic shifts of this base sequence to be used can be controlled via the downlink control information.
  • a base cyclic shift may be signaled in the DCI and said two cyclic shifts are obtained by adding one or two fixed shift values on the signaled shift.
  • said two cyclic shifts are s and s+1 when the DCI signaled a shift of s.
  • the cyclic shifts that are selected for the base sequence R(k) do not include a cyclic shift of 6, i.e., the two cyclic shifts assigned to the WD 16 will not be s and s+6.
  • one of the allocated sequences in the WD 16 may be used as S(k).
  • higher layer signaling or physical layer signaling as well as implicit rules can be used. Thereafter, the method described above of generating the two sequences S1 and S2 may be followed to create sequences S1 and S2 to be fed to the IFFT.
  • bit, b0 selects one cyclic shift out of the same base sequence or among two base sequences.
  • b0 could select among two PUCCH resources.
  • the two PUCCH resources could be the same base sequence and just differ in the cyclic shift, two different base sequences or in the more general case could be mapped to different frequencies and/or times and/or base sequences and/or cyclic shifts.
  • the one or two cyclic shifts of the base sequence R(k) and the base sequence itself may be configured via RRC to the WD. This may be adequate when there are fewer WDs 16 in the system such that there are enough base sequence and cyclic shift combinations that may be assigned to all WDs 16 in the system so that there are no ambiguities regardless of the combination of WDs 16 that transmit at any particular time.
  • Two base sequences R(k) and R'(k) may be configured for one WD 16 via RRC signaling.
  • the one common shift or two different cyclic shifts to apply to said two base sequences can be signaled to the WD 16 in the downlink control information.
  • From the 2-bit UCI one of the bits may be used to determine which base sequence to use as sequence S(k) and the other bit may be used to modulate the S1 (k) sequence sampled from S(k). This is illustrated in FIG. 14 .
  • the cyclic shifts of the two base sequences R(k) and R'(k) which are configured via RRC signaling can be further controlled via the downlink control information (DCI).
  • DCI downlink control information
  • one cyclic shift value may be signaled in the DCI and is applied to both sequences.
  • two cyclic shift values may be signaled in the DCI for said two sequences.
  • one of the allocated sequences of the WD 16 may be used as S(k).
  • higher layer signaling or physical layer signaling as well as implicit rules can be used. Thereafter, the process described above for generating sequences S1 and S2 to be fed to the IFFT may be applied.
  • no cyclic shift or base sequence values are signaled in DCI.
  • the base sequences, R(k) and R'(k), and cyclic shifts of the base sequences may be signaled only by RRC. This may be adequate when there are fewer WDs 16 in the system such that there are enough base sequence and cyclic shift combinations that may be assigned to all WDs 16 in the system so that there are no ambiguities regardless of the combination of WDs 16 that transmit at any particular time.
  • a situation may occur where the gNB sends multiple physical downlink control channel (PDCCH) assignments and the WD 16 misses some of them. For instance, the gNB may transmit two PDCCH assignments for which the ACK was supposed to be received in the form of two bits transmitted together in a short PUCCH. The WD 16 may not receive one of the PDCCH assignments. In this case, the WD 16 may infer that it needs to transmit only one ACK bit unless it is explicitly instructed to transmit two bits via DCI signaling. This can lead to poor performance.
  • PDCCH physical downlink control channel
  • the gNB requests ACK/NACK information for two successively transmitted first physical downlink shared channels (PDSCHs) and the WD 16 receives only the PDSCH and misses the second one.
  • the gNB then signals in the DCI the base sequence and a cyclic shift of s in the DCI so that the WD16 may use sequences with cyclic shifts of the base sequence R (k) with cyclic shifts of s and s+1.
  • the WD 16 may only transmit one ACK/NACK bit for the first PDSCH by transmitting shifts of s or s+6.
  • the gNB may assume that the first PDSCH was incorrectly received and that the second one was correctly received as is clear from the Table above.
  • the WD 16 intended to indicate that the first PDSCH was correctly received whereas it has no information about a second PDSCH.
  • the gNB may assume that a PDSCH that was completely missed by the WD 16 has been correctly received.
  • LTE resource element
  • NR resource element
  • LTE subframe lasting 1 ms contains 14 OFDM symbols for normal CP.
  • An NR subframe has a fixed duration of 1 ms and may therefore contain a different number of OFDM symbols for different subcarrier spacings.
  • An LTE slot corresponds to 7 OFDM symbols for normal CP.
  • An NR slot corresponds to 7 or 14 OFDM symbols; at 15 kHz subcarrier spacing, a slot with 7 OFDM symbols occupies 0.5 ms.
  • Concerning NR terminology reference is made to the 3GPP TR 38.802 v14.0.0 standards document and later versions.
  • An LTE radio frame may be functionally equivalent to an NR frame, considering that both have a duration of 10 ms.
  • An LTE eNB may be functionally equivalent to an NR gNB, since their functionalities as downlink transmitter are at least partially overlapping.
  • the least schedulable resource unit in LTE may be reinterpreted as the least schedulable resource unit in NR.
  • the shortest data set for which LTE acknowledgement feedback is possible may be reinterpreted as the shortest data set for which NR acknowledgement feedback is possible. Therefore, even though some embodiments of this disclosure have been described using LTE-originated terminology, they remain fully applicable to NR technology
  • the concepts described herein may be embodied as a method, data processing system, and/or computer program product. Accordingly, the concepts described herein may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects all generally referred to herein as a "circuit" or "module.” Furthermore, the disclosure may take the form of a computer program product on a tangible computer usable storage medium having computer program code embodied in the medium that can be executed by a computer. Any suitable tangible computer readable medium may be utilized including hard disks, CD-ROMs, electronic storage devices, optical storage devices, or magnetic storage devices.
  • These computer program instructions may also be stored in a computer readable memory or storage medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instruction means which implement the function/act specified in the flowchart and/or block diagram block or blocks.
  • the computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
  • Computer program code for carrying out operations of the concepts described herein may be written in an object oriented programming language such as Java ® or C++.
  • the computer program code for carrying out operations of the disclosure may also be written in conventional procedural programming languages, such as the "C" programming language.
  • the program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer.
  • the remote computer may be connected to the user's computer through a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).
  • LAN local area network
  • WAN wide area network
  • Internet Service Provider for example, AT&T, MCI, Sprint, EarthLink, MSN, GTE, etc.
  • the first control sequence may be obtained from odd samples of a base sequence and the second control sequence obtained from even samples of the base sequence.

Claims (15)

  1. Procédé mis en œuvre par un dispositif sans fil (16) pour fournir des informations concernant un canal de commande, le procédé comprenant :
    l'échantillonnage (S106) de l'un parmi des échantillons pairs ou des échantillons impairs d'une séquence de base et la modulation de celui échantillonné parmi les échantillons pairs ou les échantillons impairs échantillonnés pour créer une première séquence de canal de commande ;
    la mise en œuvre (S108) d'un deuxième échantillonnage de l'autre parmi les échantillons impairs ou pairs de la séquence de base pour créer une deuxième séquence de canal de commande ; et
    un multiplexage par répartition en fréquence (S110) des première et deuxième séquences de canal de commande pour produire une transmission de canal de commande, dans lequel la transmission de canal de commande comprend un symbole d'informations de commande de liaison montante, UCI, ayant au moins deux bits et dans lequel un parmi le premier ou le deuxième bit des au moins deux bits détermine un de deux décalages cycliques de la séquence de base et l'autre des premier ou deuxième bits détermine un symbole de modulation par déplacement de phase binaire, BPSK, dans lequel la modulation des échantillons pour la première séquence de canal de commande est par le symbole de modulation par déplacement de phase binaire, BPSK ; et dans lequel la deuxième séquence de canal de commande inclut un signal de référence de démodulation, DMRS.
  2. Procédé selon la revendication 1, dans lequel la transmission de canal de commande est une transmission de canal de commande de liaison montante physique court, sPUCCH.
  3. Procédé selon la revendication 1 ou la revendication 2, dans lequel les échantillons pairs sont utilisés pour la première séquence de commande et les échantillons impairs sont utilisés pour la deuxième séquence de commande.
  4. Procédé selon l'une quelconque des revendications 1 à 3,
    dans lequel les deux décalages cycliques sont basés sur un décalage cyclique de base reçu dans des informations de commande de liaison descendante, DCI ; et/ou
    dans lequel la séquence de base est une de deux séquences de base sélectionnées par un bit du symbole UCI.
  5. Dispositif sans fil (16) pour fournir des informations concernant un canal de commande le dispositif sans fil (16) comprenant :
    un circuit de traitement (42) configuré pour :
    échantillonner l'un parmi des échantillons pairs ou des échantillons impairs de la séquence de base et moduler celui échantillonné parmi les échantillons pairs ou les échantillons impairs pour créer une première séquence de canal de commande ;
    mettre en œuvre un deuxième échantillonnage d'échantillons impairs de la séquence de base pour créer une deuxième séquence de canal de commande ; et
    multiplexer par répartition en fréquence les première et deuxième séquences de canal de commande pour produire la transmission de canal de commande, dans lequel la transmission de canal de commande comprend un symbole d'informations de commande de liaison montante, UCI, ayant au moins deux bits et un parmi un premier ou un deuxième bit des au moins deux bits détermine un de deux décalages cycliques de la séquence de base et l'autre des premier ou deuxième bits détermine un symbole de modulation par déplacement de phase binaire, BPSK, dans lequel la modulation des échantillons pour la première séquence de canal de commande est par un symbole de modulation par déplacement de phase binaire, BPSK, ; et dans lequel la deuxième séquence de canal de commande inclut un signal de référence de démodulation, DMRS.
  6. Dispositif sans fil (16) selon la revendication 5, dans lequel la transmission de canal de commande est une transmission de canal de commande de liaison montante physique court, sPUCCH.
  7. Dispositif sans fil (16) selon l'une quelconque des revendications 5 et 6, dans lequel les échantillons pairs sont utilisés pour la première séquence de commande et les échantillons impairs sont utilisés pour la deuxième séquence de commande.
  8. Dispositif sans fil (16) selon l'une quelconque des revendications 5 à 7, dans lequel les deux décalages cycliques sont basés sur un décalage cyclique de base reçu dans des informations de commande de liaison descendante, DCI ; et/ou dans lequel la séquence de base est une de deux séquences de base sélectionnées par un bit d'un symbole d'informations de commande de liaison montante, UCI.
  9. Procédé mis en œuvre par un nœud de réseau (14) configuré pour traiter une transmission de canal de commande de liaison montante reçue, le procédé comprenant :
    le démultiplexage en fréquence (S100) d'une transmission de canal de commande de liaison montante reçue pour obtenir une première séquence de canal de commande et une deuxième séquence de canal de commande ;
    l'obtention (S102) d'un signal de référence de démodulation, DMRS, à partir de la deuxième séquence de canal de commande ; et la démodulation (S104) de la première séquence de canal de commande pour obtenir des informations de commande de liaison montante, UCI, dans lequel les UCI sont constituées d'au moins deux bits et un parmi le premier ou le deuxième bit des au moins deux bits correspond à
    un des deux décalages cycliques de la séquence de base ; et l'autre des premier ou deuxième bits correspond à un symbole de modulation par déplacement de phase binaire, BPSK, dans lequel la modulation des échantillons de la première séquence de canal de commande est par le symbole de modulation par déplacement de phase binaire, BPSK.
  10. Procédé selon la revendication 9, dans lequel la transmission de canal de commande de liaison montante est une transmission de canal de commande de liaison montante physique court, sPUCCH.
  11. Procédé selon les revendications 9 et 10, dans lequel la séquence de base est une de deux séquences de base sélectionnées par un bit d'informations de commande de liaison montante, UCI.
  12. Procédé selon l'une quelconque des revendications 9 à 11, comprenant en outre la transmission d'un décalage cyclique de base dans des informations de commande de liaison descendante, le décalage cyclique de base utilisé par un dispositif sans fil (16) pour mettre en œuvre un décalage cyclique d'au moins une des première et deuxième séquences de canal de commande.
  13. Nœud de réseau (14) configuré pour traiter une transmission de canal de commande reçue, le nœud de réseau (14) comprenant :
    un circuit de traitement (22) configuré pour :
    démultiplexer par répartition en fréquence une transmission de canal de commande reçue pour obtenir une première séquence de canal de commande et une deuxième séquence de canal de commande ; obtenir un signal de référence de démodulation, DMRS, à partir de la deuxième séquence de canal de commande ; et
    démoduler la première séquence de canal de commande pour obtenir des informations de commande de liaison montante, UCI, dans lequel les UCI sont constituées d'au moins deux bits dans lequel un parmi le premier ou le deuxième bit des au moins deux bits correspond à un des deux décalages cycliques de la séquence de base ; et l'autre des premier ou deuxième bits correspond à
    un symbole de modulation par déplacement de phase binaire, BPSK, dans lequel la modulation des premiers échantillons est par un symbole de modulation par déplacement de phase binaire, BPSK.
  14. Nœud de réseau (14) selon la revendication 13,
    dans lequel la séquence de base est une de deux séquences de base sélectionnées par un bit d'un symbole d'informations de commande de liaison montante, UCI ; et/ou
    dans lequel le circuit de traitement est configuré en outre pour transmettre un décalage cyclique de base dans des informations de commande de liaison descendante, le décalage cyclique de base utilisé par un dispositif sans fil (16) pour mettre en œuvre un décalage cyclique d'au moins une des première et deuxième séquences de canal de commande.
  15. Programme informatique, produit ou support de stockage lisible par ordinateur comprenant des instructions qui amènent le dispositif sans fil de la revendication 4 à mettre en œuvre l'un quelconque des procédés des revendications 1 à 4 ou amènent le nœud de réseau de la revendication 11 à mettre en œuvre l'un quelconque des procédés des revendications 9 à 12.
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